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A kayak moves at a rate of 12 mph in still water. If the rivers current flows at a rate of 5mph how long does it take the boat to travel 23 miles upstream?

  • math -

    so the effective rate = 12-5 or 7 mph

    time = 23/7 = 3.2857 hrs
    = 3 hrs and appr 17 minutes

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